17.10.03 No. ١ / 23© Festo Didactic – Training and Consulting Pneumatic symbols

Pneumatic symbols

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Pneumatic symbols

The development of pneumatic systems is assisted by a uniform approach to the representation of the elements and the circuits. The symbols used for the individual elements must display the following characteristics:

• Function

• Actuation and return actuation methods

• Number of connections

• Number of switching positions

• General operating principle

• Simplified representation of the flow path

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A symbol does not represent the following characteristics:

• Size or dimensions of the component

• Particular manufacturer, methods of construction or costs

• Operation of the ports

• Any physical details of the elements

• Any unions or connections other than junctions

The standard used is ISO 1219

Pneumatic symbols

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Energy supply

Compressor with fixed capacity

Air receiver and ‘T’ junction

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Air service equipment

Air filter

Air lubricator

Pressure regulator

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Air service equipment

Air service unit

filter

Regulator

Gauge

Lubricator

Simplified air

Service unit

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Directional control valves

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Directional control valves

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Directional control valves

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Directional control valves

Methods of actuation

MechanicalGeneral manual operation

Push button

Lever operated

Detent lever operated

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Directional control valves

Methods of actuation

Mechanical

Foot pedal

Roller operated

Idle return, roller

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Methods of actuation

Mechanical

Spring return

Spring centered

Directional control valves

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Directional control valves

Methods of actuation

Pneumatic

Direct pneumatic actuation

Indirect pneumatic

actuation (piloted)

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Non-return valves

Check valve

Spring loaded check valve

Shuttle valve: ‘or’ function

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Non-return valves

Two pressure valve:‘AND’ function

Quick exhaust valve

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Flow control valves

Flow control valve adjustable

One-way flow control valve

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Pressure valves

Adjustable pressure regulating valve,

non-relieving type

Adjustable pressure regulating valve,

relieving type (overloads are vented)

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Pressure valves

Sequence valve combination

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Linear actuators

Single acting cylinder

Double acting cylinder

Double acting cylinder with

double ended piston rod

Rodless cylinder

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Linear actuators

Double-acting cylinder with non-adjustable cushioning in one direction

Double-acting cylinder with single adjustable cushioning

Double-acting cylinder with adjustable cushioning at both ends

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Rotary actuators

Air motor, rotation in one direction, fixed capacity

Air motor, rotation in one direction, variable capacity

Air motor, rotation in both directions, variable capacity

Rotary actuator, limited travel, rotation in both directions

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Auxiliary symbols

Exhaust port

Exhaust port with threaded connection

Silencer

Line connection

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Auxiliary symbols

Crossing lines (not connected)

Pressure gauge

Visual indicator